You can also add customer escalations for individual performance issues. If the consulting project has delivery responsibility at end of project on T&M, then SLA can be that vendor's actual efforts deviation should not be more than 10% of the initial estimations. Or similar others on performance or outcome based.

Our Company has Ariba as well. We utilize DocuSign within Ariba. Which we began using at the end of 2018. It has eliminated the process of the additional step of uploading a completed document manually into Ariba. DocuSign sends the completed document back to a folder of your choosing to the contract workspace.